Conditional Plugin Hack for Main page

Im trying to hack a plugin so that it only initiates on the home page by using an ‘is_home()’ conditional statement. It conflicts with a script I am trying to use on post pages. Unfortunately it doesn’t seem to be working and I don’t know why, here is the modified code I have been trying to use:

<?php
if ( is_home() ) {
function gallery_styles() {
    /* The next lines figures out where the javascripts and images and CSS are installed,
    relative to your wordpress server's root: */
    $gallery_path =  get_bloginfo('wpurl')."/wp-content/plugins/featured-content-gallery/";

    /* The xhtml header code needed for gallery to work: */
	$galleryscript = "
	<!-- begin gallery scripts -->
    <link rel=\"stylesheet\" href=\"".$gallery_path."css/jd.gallery.css.php\" type=\"text/css\" media=\"screen\" charset=\"utf-8\"/>
	<link rel=\"stylesheet\" href=\"".$gallery_path."css/jd.gallery.css\" type=\"text/css\" media=\"screen\" charset=\"utf-8\"/>
	<script type=\"text/javascript\" src=\"".$gallery_path."scripts/mootools.v1.11.js\"></script>
	<script type=\"text/javascript\" src=\"".$gallery_path."scripts/jd.gallery.js.php\"></script>
	<script type=\"text/javascript\" src=\"".$gallery_path."scripts/jd.gallery.transitions.js\"></script>
	<!-- end gallery scripts -->\n";

	/* Output $galleryscript as text for our web pages: */
	echo($galleryscript);
}

function get_a_post($id='GETPOST') {
	global $post, $tableposts, $tablepostmeta, $wp_version, $wpdb;

	if($wp_version < 1.5)
		$table = $tableposts;
	else
		$table = $wpdb->posts;

	$now = current_time('mysql');
	$name_or_id = '';
	$orderby = 'post_date';

	if( !$id || 'GETPOST' == $id || 'GETRANDOM' == $id ) {
		if( $wp_version < 2.1 )
			$query_suffix = "post_status = 'publish'";
		else
			$query_suffix = "post_type = 'post' AND post_status = 'publish'";
	} elseif('GETPAGE' == $id) {
		if($wp_version < 2.1)
			$query_suffix = "post_status = 'static'";
		else
			$query_suffix = "post_type = 'page' AND post_status = 'publish'";
	} elseif('GETSTICKY' == $id) {
		if($wp_version < 1.5)
			$table .= ', ' . $tablepostmeta;
		else
			$table .= ', ' . $wpdb->postmeta;
		$query_suffix = "ID = post_id AND meta_key = 'sticky' AND meta_value = 1";
	} else {
		$query_suffix = "(post_status = 'publish' OR post_status = 'static')";

		if(is_numeric($id)) {
			$name_or_id = "ID = '$id' AND";
		} else {
			$name_or_id = "post_name = '$id' AND";
		}
	}

	if('GETRANDOM' == $id)
		$orderby = 'RAND()';

	$post = $wpdb->get_row("SELECT * FROM $table WHERE $name_or_id post_date <= '$now' AND $query_suffix ORDER BY $orderby DESC LIMIT 1");
	get_post_custom($post->ID);

	if($wp_version < 1.5)
		start_wp();
	else
		setup_postdata($post);
}

/* we want to add the above xhtml to the header of our pages: */
add_action('wp_head', 'gallery_styles');
add_action('admin_menu', 'gallery_options_page');
}
?>

Im not an experienced developer so I am sure my problem is probably pretty simple… Any ideas?